What is CVE-2002-0234?A low-severity flaw in Netscreen Screenos, explained.
CVE-2002-0234 is a low-severity flaw (CVSS 2.1) in Netscreen Screenos from Juniper, published on 29 May 2002. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 0.4%. If you run an affected version, plan in the vendor’s fix.
Published 29 May 2002. Record last updated 16 June 2026. We keep this page's data up to date.
What is CVE-2002-0234? In plain terms.
An attacker has to be already on the device without logging in. If it works, the attacker can slow it down.
NetScreen ScreenOS before 2.6.1 does not support a maximum number of concurrent sessions for a system, which allows an attacker on the trusted network to cause a denial of service (resource exhaustion) via a port scan to an external network, which consumes all available connections.
What kind of flaw is it?
- UnknownUnknown
How an attack on it works
Read straight from its severity rating, translated out of the shorthand.
- Where an attacker can beAlready on the device
- How hard it is to pull offEasy: no special conditions
- Login needed firstNo login needed
- What an attacker getsCan slow it down
Severity vector: AV:L/AC:L/Au:N/C:N/I:N/A:P
Is CVE-2002-0234 being exploited? Not that we know of.
It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.4%. That can change at any time, which is why we keep watching.
Timeline
- Published
- Exploit likelihood fell
- Exploit likelihood jumped
- Record last updated
CVE-2002-0234 scores 11. Action: Track.
We keep the score of every published flaw up to date as the evidence changes. Four things go into the score, and evidence that criminals are actually using it counts most. In order:
- Evidence it is being exploitedBiggest factor
- How severe it isStrong factor
- How widely exposed it isSmaller factor
- Threat activity around itSmaller factor
85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score.
When CVE-2002-0234 matches software you track, it lands in your list with its score and the reasons behind it.
See your own ranked list →Who is affected by CVE-2002-0234? One product.
The published record lists 1 product from 1 vendor. If you run one of these, check your version, then go to the fix below.
- Operating system
Netscreen Screenos
by Juniper
Affected versionsup to 2.6.1
How do I fix CVE-2002-0234? Four steps.
- Check whether you run itCompare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
- Apply the vendor’s fixInstall the update named in the vendor’s advisory. We’ve put the advisories and patch notes first in the list.
- If you can’t patch todayFollow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
- Keep an eye on itTrack the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.
Does CVE-2002-0234 affect you? We'll keep checking.
Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.
- Tell us what you runPick your software from a list, or let us work it out from your website.
- We match it to every flawOver 400,000 published flaws, checked against your list.
- Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
- Told as soon as we knowAn alert by email, in the app or by webhook to your own tools.
Free plan, no card needed. Nothing to install.
1 new flaw affects software Acme tracks
NetScreen ScreenOS before 2.6.1 does not support a maximum number of concurrent sessions for a system, which allows an attacker on the trusted network to cau...
- Matched to
- Netscreen Screenos on Acme's software list
- What to do
- Plan in the vendor’s update
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
CVE-2002-0234 is a low-severity flaw in Netscreen Screenos from Juniper, published on 29 May 2002. An attacker has to be already on the device without logging in. If it works, the attacker can slow it down.
It scores 2.1 out of 10 on the CVSS severity scale, which is low. Our risk score for CVE-2002-0234 is 11 out of 100, which is Info. Its action is "Track". No sign of exploitation and a low forecast. Patch it in your normal update cycle.
It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.4%. That can change at any time, which is why we keep watching.
For Netscreen Screenos from Juniper: up to 2.6.1.
Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.